bg=new Image();bg.src="_assets/bg.jpg";
logo=new Image();logo.src="_assets/logo.jpg";
welcome=new Image();welcome.src="_assets/header_welcome.gif";
services=new Image();services.src="_assets/header_services.gif";
downloads=new Image();downloads.src="_assets/header_downloads.gif";
contact=new Image();contact.src="_assets/header_contact.gif";
footer=new Image();footer.src="_assets/bg_footer.gif";
arrow_up=new Image();arrow_up.src="_assets/arrow_up_off.gif";
arrow_down=new Image();arrow_down.src="_assets/arrow_down_off.gif";
arrow_up_on=new Image();arrow_up_on.src="_assets/arrow_up_on.gif";
arrow_down_on=new Image();arrow_down_on.src="_assets/arrow_down_on.gif";